Heather, It sounds like to me that the parents don't want to sit down and work w/their son. If that's the case, I really feel bad for the young man. I realize parents are busy, etc., but there's nothing like sitting down w/a child and working w/them if they are having difficulties w/their homework.
The young may did exactly what you asked of him. Sounds to me like the mother is expecting a lot not only from you, but their son as well.
Sometimes being pushy ruins the fun of going to school and learning.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.